Douglasite is a mineral with the formula 2KCl FeCl2 2H2O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000 M AgNO3 solution to precipitate all the Cl as AgCl. Assume the douglasite is the only source of chloride ion.
Week 2 Psychology Class Notes Goals in Psychology: Measurement and description Understanding and prediction Hypothesis – test theories from different angles Variables Application and control Theory Brands Priming: affects behavior without thinking about it Scientific Methods Specify a hypothesis/theory Design a study – get opinion Collect data Analyze data Report the results Ways to Study Problems -‐ Natural observation -‐ Participant observation – the Doomsday Cult -‐ Case study – The 3 Faces of Eve -‐ Survey Method -‐ Archival Research – going in past archives to see if you could find something -‐ Correlational Research: the strength of the association between 2 variables o -‐1 to 1 (closer to 0, the smaller the correlation) o positive to negative o prediction of the value of one from the other o causation: § ex. TV aggression in children § third variable problem -‐ Experimental Research o Causation o Experimental group VS Control group o Independent and dependent variables o Random assignment and control is important § Confounding variables Potential confounds in research: -‐ sampling bias: not representative of the population o generalizations -‐ placebo effects -‐ self report distortions o social desirability bias -‐ Experimenter bias o clever hans
